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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1690225

Title:
  nvidia-docker on ppc64le-ubuntu16.04  issue due to cross-thread naming
  if !PR_DUMPABLE

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  == Comment: #0 - Breno Henrique Leitao <brenohl@xxxxxxxxxx> - 2017-05-11 15:30:52 ==
  The PR_DUMPABLE flag causes the pid related paths of the proc file system to be owned by ROOT.
      
      The implementation of pthread_set/getname_np however needs access to  /proc/<pid>/task/<tid>/comm.  If PR_DUMPABLE is false this implementation is locked out.
      
      This patch installs a special permission function for the file "comm"  that grants read and write access to all threads of the same group  regardless of the ownership of the inode.  For all other threads the  function falls back to the generic inode permission check.

  Nvidia-docker issue on ppc64le:

  1b3044e39a89cb1d4d5313da477e8dfea2b5232d

  This is fixed by commit 1b3044e39a89cb1d4d5313da477e8dfea2b5232d

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